Decimal precision intermittently resets between cell executions

[evan-burke]

Hi, I had opened a Jupyter issue on this, but it sounds like this is a better place for it.

In short:
Setting decimal precision via decimal.getcontext().prec = x intermittently fails to retain the precision setting between cell executions, often resetting decimal precision to 28.

More detail in the original issue:
jupyter/notebook#5260

Let me know if you need any other details - thanks!

[mdickinson]

I believe this is a case of ipython/ipython#11565.